- AAll materials.
- BOnly ferromagnetic materials and their ores.
- CSome materials and repels some other materials.
- DOnly iron and its ores but does not repel any material.
Explanation:
There are only three types of materials diamagnetic, paramagnetic and ferromagnetic.
Diamagnetic materials will be repeled feebly.
Paramagnetic materials will be attracted feebly.
Only Ferromagnetic materials gets attracted very strongly.
As well as their ores also because they will also be ferromagnetic in nature.
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In a transistor configuration b-parameter is
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(a) |
(b) |
(c) |
(d) |
The number of turns and radius of cross-section of the coil of a tangent galvanometer are doubled. The reduction factor K will be
| (a) K |
(b) 2K |
(c) 4K |
(d) K/4 |
Monochromatic green light of wavelength 5 illuminates a pair of slits 1 mm apart. The separation of bright lines on the interference pattern formed on a screen 2 m away is
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(a) 0.25 mm |
(b) 0.1 mm |
(c) 1.0 mm |
(d) 0.01 mm |
A thin glass (refractive index 1.5) lens has optical power of -5D in air. It's optical power in a liquid medium with refractive index 1.6 will be
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(a) 25 D |
(b) – 25 D |
(c) 1 D |
(d) None of these |